html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  min-height: 100%;
  overflow: hidden;
  display: flex;
  justify-content: center; /* centra orizzontalmente */
  align-items: center;     /* centra verticalmente */
  background-color: transparent;
  color: #3a86ff;
  font-family: monospace;
  font-size: 15px;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  -o-object-fit: contain;
  object-fit: contain;
  background: #fff;
}